IDENTIFYING TOPICS AND MAIN IDEA



The main idea of a paragraph is the primary point or concept that the author wants to communicate to the readers about the topic. In a paragraph, when the main idea is stated directly, it is expressed in what is called the topic sentence. It gives the overarching idea of what the paragraph is about and is supported by the details in subsequent sentences in the paragraph. In a multi-paragraph article, the main idea is expressed in the thesis statement, which is then supported by individual smaller points.

Think of the main idea as a brief but all-encompassing summary. It covers everything the paragraph talks about in a general way, but does not include the specifics. Those details will come in later sentences or paragraphs and add nuance and context; the main idea will need those details to support its argument.

For example, imagine a paper discussing The Causes of Wolrd War I. One paragraph might be dedicated to the role that imperialism played in the conflict. The main idea of this paragraph might be something like: "Constant competition for massive empires led to increasing tensions in Europe that eventually erupted into World War I." The rest of the paragraph might explore what those specific tensions were, who was involved, and why the countries were seeking empires, but the main idea just introduces the overarching argument of the section.

When an author does not state the main idea directly, it should still be implied and is called an implied main idea. This requires that the reader look closely at the content—at specific words, sentences, and images that are used and repeated—to deduce what the author is communicating.

How to Find the Main Idea

Finding the main idea is critical to understanding what you are reading. It helps the details make sense and have relevance and provides a framework for remembering the content. Try these specific tips to catch the main idea of a passage.

1) Identify the Topic

Read the passage through completely, then try to identify the topic. Who or what is the paragraph about? This part is just figuring out a topic like "cause of World War I" or "new hearing devices;" don't worry yet about deciding what argument the passage is making about this topic.

2) Summarize the Passage

After reading the passage thoroughly, summarize it in your own words in one sentence. Pretend you have just ten to twelve words to tell someone what the passage is about—what would you say?

3) Look at the First and Last Sentences of the Passage

Authors often put the main idea in or near either the first or last sentence of the paragraph or article, so isolate those sentences to see if they make sense as the overarching theme of the passage. Be careful: sometimes the author will use words like but, however, in contrast, nevertheless, etc. that indicate that it's the second sentence is actually the main idea. If you see one of these words that negates or qualifies the first sentence, that is a clue that the second sentence is the main idea.

4) Look for Repetition of Ideas

If you read through a paragraph and you have no idea how to summarize it because there is so much information, start looking for repeated words, phrases, or related ideas. 

Read this example paragraph:

A new hearing device uses a magnet to hold the detachable sound-processing portion in place. Like other aids, it converts sound into vibrations, but it is unique in that it can transmit the vibrations directly to the magnet and then to the inner ear. This produces a clearer sound. The new device will not help all hearing-impaired people—only those with hearing loss caused by infection or some other problem in the middle ear. It will probably help no more than 20 percent of all people with hearing problems. Those people who have persistent ear infections, however, should find relief and restored hearing with this new device.

What does this paragraph consistently talk about? A new hearing device. What is it trying to convey? A new hearing device is now available for some, but not all, hearing-impaired people. That's the main idea!



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